`tan^-1 (1/3)+tan^-1 (1/7)+tan^-1 (1/13)+…+tan^-1(1/(1+n+n^2))+….to oo` is equal to (A) `(2pi)/3` (B) 0 (C) `pi/2` (D) `pi/4`

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tan^(-1)(x/y)-tan^(-1)(x-y)/(x+y) is equal to (A) pi/2 (B) pi/3 (C) pi/4 (D) (-3pi)/4

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"tan"^(-1)((1)/(3))+ "tan"^(-1)((2)/(9)) + tan^(-1)((4)/(3^(3))) + ....oo is equal to

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